This has been an interesting post for me, too. I have fought the "shooting too quickly" syndrome for all the years (20 plus) I have been shooting a longbow. For a long time it was target panic where I couldn't even get to full draw. I finally got that under control enough that I can get to full draw, but I have to constantly work to hold long enough to have a solid anchor and be on target. Sometimes I get in a rythmn of shooting quickly with the pull through to which Terry refers and I hit pretty well, but I always feel slightly out of control. Then when I try to slow down my shot to be in control, I find myself collapsing at release and the timing and rythmn is off. I've watched MMBB3 numerous times, watched videos of Rick Welches students, tried holding for 2, 3, 4 or 5 seconds, blank bale shooting, closing my eyes and holding at full draw, changing my focus to the point of the arrow as I draw (Viper's suggestion). Finally, what recently seems to be the most effective is to come to my solid anchor and hold until the shot feels right to release. Counting to a specific number doesn't work, because then I anticipate the release. Mentally I have to just make up my mind I am going to pull to anchor and hold until I feel as if I am in control. As I'm holding at full draw I focus on getting my shoulders lined up correctly, solid bow arm and pulling straight back with back tension. Actually this is easier to do with a heavier bow that forces me to engage the back muscles in order to hold it right.
I share the concern of those who mentioned needing to stop at full draw lest I begin rushing the shot again. I understand the concept of "reference point rather than anchor", but for me I am going to have to work in to that idea after spending some time ingraining holding long enough to have control of the shot. As Zetabow points out, it will be worth the effort to make the change eventually, but I believe I must take first steps first, so to speak. Sorry for the long drawn out post, but for some of us who learned to shoot the incorrect way over a long period of time, it may not be as easy as it has been for those fortunate individuals who were able to develop good form from the beginning.